LED LCD vs. Plasma vs. CCFL LCD
In television technology trifecta of LED LCD, plasma, and LCD, which comes out on top? The subject of countless debates and diatribes, the better question is: which works best? Or more precisely, which works best for you? Each tech has different costs and benefits, and to help you figure out which one suits you best let’s have a look at them.
Plasma Display Panel and what is looks like
A Plasma Display Panel (PDP) is a type of flat panel display which ranges between 42-65 inches, sometimes even larger. The first plasma display monitor was invented in July 1964 at the University of Illinois, by professors Donald Bitzer and Gene Slottow, but it could only produce green or orange light, and only in 1992, the world's first full-colour display was presented. Now, the largest one presented in 2006, in Las Vegas, at an electronics exhibition, measures 103 inches. They are called "plasma" displays because the technology operates small cells containing electrically charged ionized gases, or what are in essence chambers more commonly known as fluorescent lamps. Each pixel is made up of three fluorescent lights, a red light, a green light and a blue light, which are evenly distributed on the screen. By combining these colours in different proportions and intensities of different lights, the television set can produce the entire colour spectrum.
Figure 2: The three florescent lights in each pixel of Plasma T.V
The central element in a fluorescent light is plasma, a gas made up of free-flowing ions and electrons. Under normal conditions, a gas is made up mainly of uncharged particles, meaning that the individual gas atoms include equal numbers of protons and electrons, so that the net charge is ...
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...ectrodes, and LED cathodes, which are negatively charged electrodes. In contrast, a traditional LCD TV utilizes fluorescent lamps for backlighting. These lamps function by using mercury vapour to create ultraviolet rays, which in turn cause the phosphor coating of the lamps to glow. LEDs have several advantages over fluorescent lamps, including requiring less energy and being able to produce brighter on-screen colours.
Difference between Edge lighting and Direct backlight in the LED LCD TV.
CCFL LCD TV
CCFL's (Cold Cathode Fluorescent Lamp) are an older technology, and for the moment are the most widely used backlights in laptops LCDs. They consist of a fluorescent tube connected to a voltage inverter board which provides power to the backlight. Sometimes the backlight contains 2 tubes along with 2 pairs of inverters; these are called "Dual Backlights" or 2-CCFL.
There are many physical properties of neon, such as the fact that it is colorless, odorless, and tasteless. Also, neon is lighter than air. With a density of density 0.89990 g/liter. The freezing point of neon is -248.67° C, and the boiling point of neon is -246.048° C, which is even lower than the boiling point of nitrogen (-195.8°C). When under low pressure, neon emits a bright orange-red glow if a small electric current is passed through it. The electron configuration of neon is 1s22s22p6. The chemical properties of neon include the fact that it is not reactive because it has a full outer shell, and therefore cannot gain or lose any electrons. Because of this, neon belongs to a group of elements called "noble gases." These are all gases which have a full outer shell and cannot react in nature. The period of neon is 2, and the group is 18.
This Experiment is a way of successfully viewing the emission spectra for metal carbonates. By heating the carbonates electrons go from there normal state called ground state to a higher energy state called excited state and the difference in electron energy gap of each metal carbonate makes up the difference of colours. This excited state is not a stable state but while in this state the atom gains additional energy but the variation of energy emitted is a characteristic of that in particular element. In this state the electrons emit photons which is the energy that corresponds to light wavelengths and therefore produces the different light emissions.
Another main version of the television was patented in 1929. This was Vladimir K. Zworykin’s kinescope, which was a cathode-ray tube. The storage principle it used is one of the main components of modern-day televisions.
According to Martin, C. (2011) the consumers have already experienced the first and second screen revolutions in the past decades and are now in the middle of the third screen revolution.
The ‘Golden Age of Television’ is what many refer to as the period between the 1950s and 60s when the television began to establish itself as a prevalent medium in the United States. In 1947, the American Broadcasting Company (ABC), Columbia Broadcasting System (CBS), the National Broadcasting Company (NBC), and the Du Mont Network were the four main television networks that ran stations with regular programming taking place. (Television, 2003) While regular television programming was a new innovation, the television itself had been commercially available for over twenty years prior to the 50s. It was conceived by many worldly innovators and went through several testing stages before it was finally completed in the late twenties. The three main innovators were Niplow - who first developed a rotating disk with small holes arranged in a spiral pattern in 1884, Zworykin - who developed the Iconoscope which could scan pictures and break them into electronic signals (a primitive form of the Cathode Ray Tube) in 1923, and lastly Fansworth - who demonstrated for the first time that it was possible to transmit an electrical image in 1927. (Rollo, 2011) However, one of the many reasons why this medium was successful in the 50s was due to the fact that it became more accessible to the public. Television sets were more affordable to middle class citizens which created further interest in the new technology. Through an historical account of the medium, the spread of television across America throughout this particular decade will be examined.
It started with the British, with the arc lamp in 1835. For years after people around the world experimented on an incandescent lamp. They tried things like filling the bulb with gas but they did not last very long and they were very expensive. Finally in 1879, Thomas Edison made a bamboo filament (the part of the bulb that actually makes the light) that was able to last 1,200 hours. Lighting has changed over the years but some of the new inventions still were made in the 1800’s. Glassblower Heinrich Geissler and physician Julius Plücker discovered that they could make light by removing almost all of the air from a long glass tube and by passing an electrical current through it. They called it the Geissler tube. In the early 1900’s Peter Cooper Hewitt made the fluorescent lamp. While the Cooper Hewitt lamps were more efficient than incandescent bulbs, no one really used them because of the blue green color of the light. European researchers made neon tubes coated with phosphors (that made the light white). In the mid and late 1930s the U.S. was showing the fluorescent lights to the navy and at the 1939 New York World’s Fair. These lights lasted longer and were about three times more efficient than incandescent bulbs. In 1976, Edward Hammer at General Electric figured out how to bend the fluorescent tube into a spiral shape, creating the first compact fluorescent light
...sed using a spectroscope. Neon is often used in signs because of its production of an unmistakable bright reddish-orange light. Although still referred to as "neon", other colors are generated with the variety of noble gases and by various colors of fluorescent lighting. Neon is also used in vacuum tubes, high-voltage indicators, lightning arrestors, wave meter tubes, television tubes, and helium neon lasers. When Neon is liquefied it is commercially used as a cryogenic refrigerant and the lower temperature range becomes more attainable with more the extreme liquid helium refrigeration. Neon both as a gas and a liquid are relatively expensive for example; the price of liquid neon even in small quantities can be more than 55 times that of liquid helium. The reason for neon's expense is because of neon’s rarity which unlike helium, can only be obtained from the air.
3) Stokes shift - Generally the emitted fluorescent light has a longer wavelength and lower energy than the absorbed light. This phenomenon is known as Stokes shift. It is due to the loss of energy between the time a photon is absorbed and when it is emitted.
William Ramsay also discovered Neon. First of all, when Neon is charged with electricity, it only emits an orange-red glow. All other common neon colors are produced from different gasses. Those colors vary from green to yellow. The neon lights can also be colored by changing the color of the glass tubing that the gas and electricity are in.
Up until 1935, televisions were not electric as they are today. They were mechanical, powered by a small motor with a spinning disc and a neon lamp. The picture projected was very small, sometimes half the size of a business card, and only showed shades of orange and red. From 1935 up until World War II, the electric television was perfected and made ready for public distribution. The electric television provided a much larger, clearer screen with a full range of colors. In 1948-1949, during the post-WWII spending craze, the television became a must-have item for every American family, bringing a world of information and entertainment into living rooms across the country and changing the way Americans viewed many things.
Before television existed people had to depend on Radio stations to receive their little bit of entertainment and news. But in 1878, the invention of TV began. The first TV made didn’t look anything like the way TV’s look today. It was a mechanical camera with a large spinning disc attached to it (Kids Work). But as over the years, of course, inventions of different TV’s progressed and by the 20th century about 90 percent of our population had a TV in their household (MGHR). Television today is mainly used for people take a break from their life by relaxing and enjoying some entertainment.
Lauginie, P. n.d. Drummond Light, Limelight: a Device in its Time. [e-book] Université Paris-Sud, France: Groupe d’Histoire et de Diffusion des Sciences d’Orsay (GHDSO). http://archive.ihpst.net/2013/Procs/Lauginie.pdf [Accessed: 19 Jan 2014].
These devices are attached to the motherboard through different connections. The output devices like monitors and printers can be used by a file server to show different files or print hard copies of files. These devices take the data from the computer and put it into a format that users can read and understand. I would like to take a moment here and go over the different kinds of monitors that a person can use as an output device. The first is the regular CRT monitors are heavy and use a lot of electric power to display objects, but are preferred by graphical artist for the color rendition. Then there are the flat panel monitors, which can use liquid Crystal Display (LCD) or a plasma display. These displays use electronically at each pixel to control the color. The input devices like a keyboards and a mouse. These inputs take the movements from the users and turn it into data that the computer can understand. (Beach,
27 Jan. 2012. Greenblatt, Alan. “Television's Future.” CQ Researcher, Vol. 17 (2007, February 16): 145-168.
You can see this experiment going on in many different places, except they tend to use different atoms. The most common would be neon signs. The main color emitted when a free electron hits a neon atom is red, and with the high voltage, there will be many collisions that produce red light. Also since the voltage is variable, the origin of the multiple red lights shifts very quickly making it seem as if the whole thing is constantly emitting red light.